d_path: Make d_path() use a struct path

d_path() is used on a <dentry,vfsmount> pair. Lets use a struct path to
reflect this.

[[e-mail]: fix build in mm/memory.c]
Signed-off-by: Jan Blunck <[e-mail]>
Acked-by: Bryan Wu <[e-mail]>
Acked-by: Christoph Hellwig <[e-mail]>
Cc: Al Viro <[e-mail]>
Cc: "J. Bruce Fields" <[e-mail]>
Cc: Neil Brown <[e-mail]>
Cc: Michael Halcrow <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/blackfin/kernel/traps.c

···
 			struct vm_area_struct *vma = vml->vma;
 
 			if (address >= vma->vm_start && address < vma->vm_end) {
+				char _tmpbuf[256];
 				char *name = p->comm;
 				struct file *file = vma->vm_file;
-				if (file) {
-					char _tmpbuf[256];
-					name = d_path(file->f_dentry,
-					              file->f_vfsmnt,
-					              _tmpbuf,
-					              sizeof(_tmpbuf));
-				}
+
+				if (file)
+					name = d_path(&file->f_path, _tmpbuf,
+						      sizeof(_tmpbuf));
 
 				/* FLAT does not have its text aligned to the start of
 				 * the map while FDPIC ELF does ...

drivers/md/bitmap.c

···
 /* copy the pathname of a file to a buffer */
 char *file_path(struct file *file, char *buf, int count)
 {
-	struct dentry *d;
-	struct vfsmount *v;
-
 	if (!buf)
 		return NULL;
 
-	d = file->f_path.dentry;
-	v = file->f_path.mnt;
-
-	buf = d_path(d, v, buf, count);
+	buf = d_path(&file->f_path, buf, count);
 
 	return IS_ERR(buf) ? NULL : buf;
 }

drivers/usb/gadget/file_storage.c

···
 
 	down_read(&fsg->filesem);
 	if (backing_file_is_open(curlun)) {	// Get the complete pathname
-		p = d_path(curlun->filp->f_path.dentry,
-				curlun->filp->f_path.mnt, buf, PAGE_SIZE - 1);
+		p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
 		if (IS_ERR(p))
 			rc = PTR_ERR(p);
 		else {
···
 		if (backing_file_is_open(curlun)) {
 			p = NULL;
 			if (pathbuf) {
-				p = d_path(curlun->filp->f_path.dentry,
-					curlun->filp->f_path.mnt,
-					pathbuf, PATH_MAX);
+				p = d_path(&curlun->filp->f_path,
+					   pathbuf, PATH_MAX);
 				if (IS_ERR(p))
 					p = NULL;
 			}

fs/compat_ioctl.c

···
 	/* find the name of the device. */
 	path = (char *)__get_free_page(GFP_KERNEL);
 	if (path) {
-		fn = d_path(filp->f_path.dentry, filp->f_path.mnt, path, PAGE_SIZE);
+		fn = d_path(&filp->f_path, path, PAGE_SIZE);
 		if (IS_ERR(fn))
 			fn = "?";
 	}

fs/dcache.c

···
 
 /**
  * d_path - return the path of a dentry
- * @dentry: dentry to report
- * @vfsmnt: vfsmnt to which the dentry belongs
+ * @path: path to report
  * @buf: buffer to return value in
  * @buflen: buffer length
  *
···
  *
  * "buflen" should be positive. Caller holds the dcache_lock.
  */
-char *d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
-	     char *buf, int buflen)
+char *d_path(struct path *path, char *buf, int buflen)
 {
 	char *res;
 	struct path root;
···
 	 * user wants to identify the object in /proc/pid/fd/.  The little hack
 	 * below allows us to generate a name for these objects on demand:
 	 */
-	if (dentry->d_op && dentry->d_op->d_dname)
-		return dentry->d_op->d_dname(dentry, buf, buflen);
+	if (path->dentry->d_op && path->dentry->d_op->d_dname)
+		return path->dentry->d_op->d_dname(path->dentry, buf, buflen);
 
 	read_lock(&current->fs->lock);
 	root = current->fs->root;
 	path_get(&current->fs->root);
 	read_unlock(&current->fs->lock);
 	spin_lock(&dcache_lock);
-	res = __d_path(dentry, vfsmnt, &root, buf, buflen);
+	res = __d_path(path->dentry, path->mnt, &root, buf, buflen);
 	spin_unlock(&dcache_lock);
 	path_put(&root);
 	return res;

fs/dcookies.c

···
 		goto out;
 
 	/* FIXME: (deleted) ? */
-	path = d_path(dcs->path.dentry, dcs->path.mnt, kbuf, PAGE_SIZE);
+	path = d_path(&dcs->path, kbuf, PAGE_SIZE);
 
 	if (IS_ERR(path)) {
 		err = PTR_ERR(path);

fs/nfsd/export.c

···
 	char *pth;
 
 	qword_add(bpp, blen, exp->ex_client->name);
-	pth = d_path(exp->ex_path.dentry, exp->ex_path.mnt, *bpp, *blen);
+	pth = d_path(&exp->ex_path, *bpp, *blen);
 	if (IS_ERR(pth)) {
 		/* is this correct? */
 		(*bpp)[0] = '\n';

fs/proc/base.c

···
 	if (!tmp)
 		return -ENOMEM;
 
-	pathname = d_path(path->dentry, path->mnt, tmp, PAGE_SIZE);
+	pathname = d_path(path, tmp, PAGE_SIZE);
 	len = PTR_ERR(pathname);
 	if (IS_ERR(pathname))
 		goto out;

fs/seq_file.c

···
 {
 	if (m->count < m->size) {
 		char *s = m->buf + m->count;
-		char *p = d_path(path->dentry, path->mnt, s,
-				 m->size - m->count);
+		char *p = d_path(path, s, m->size - m->count);
 		if (!IS_ERR(p)) {
 			while (s <= p) {
 				char c = *p++;

include/linux/dcache.h

···
 #include <linux/rcupdate.h>
 
 struct nameidata;
+struct path;
 struct vfsmount;
 
 /*
···
  */
 extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...);
 
-extern char * d_path(struct dentry *, struct vfsmount *, char *, int);
-  
+extern char *d_path(struct path *, char *, int);
+
 /* Allocation counts.. */
 
 /**

kernel/audit.c

···
 		audit_log_format(ab, "<no memory>");
 		return;
 	}
-	p = d_path(path->dentry, path->mnt, pathname, PATH_MAX+11);
+	p = d_path(path, pathname, PATH_MAX+11);
 	if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
 		/* FIXME: can we save some information here? */
 		audit_log_format(ab, "<too long>");

mm/memory.c

···
 		if (buf) {
 			char *p, *s;
 
-			p = d_path(f->f_dentry, f->f_vfsmnt, buf, PAGE_SIZE);
+			p = d_path(&f->f_path, buf, PAGE_SIZE);
 			if (IS_ERR(p))
 				p = "?";
 			s = strrchr(p, '/');